Fishes . Fig. 60.—Larval Flounder, Pseudopleuronectes americanus. (After S. R. Williams.). Fig. 61.—Larval Flounder, Pseudopleuronectes americanus. (.\fterS. R. Williams.) evidence of it, whereas in Lophopsetta maculata, the window-pane flotmder, the air-sac can often be seen by the naked eyeup to the time when the fish assumes the adult coloration, andlong after it has assumed the adult form. Cunningham has suggested that the weight of the fishacting upon the lower eye after the turning would press ittoward the upper side out of the way. But in all probability theplanktonic larva rests on the
Fishes . Fig. 60.—Larval Flounder, Pseudopleuronectes americanus. (After S. R. Williams.). Fig. 61.—Larval Flounder, Pseudopleuronectes americanus. (.\fterS. R. Williams.) evidence of it, whereas in Lophopsetta maculata, the window-pane flotmder, the air-sac can often be seen by the naked eyeup to the time when the fish assumes the adult coloration, andlong after it has assumed the adult form. Cunningham has suggested that the weight of the fishacting upon the lower eye after the turning would press ittoward the upper side out of the way. But in all probability theplanktonic larva rests on the sea-bottom little if at all beforemetamorphosing. Those taken by Mr. Williams into the labora-tory showed in resting no preference for either side until the eyewas near the midline. 7« Instincts, Habits, and Adaptations
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